Heat exchange roll or drum



Filed July 6, 1953 R. c. SEANOR 2,783,977 Haw-EXCHANGE ROLL OR DRUM 2 She'ets-Sheet l C C J r E Rex C- SEA/we Arm/un s f I m My; J

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March 5, 1957 R. c. SEANOR 2,783,977 HEAT EXCHANGE ROLL OR DRUM Filed July 6, 195

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ATTQENEYS United States Patent HEAT EXCHANGE ROLL OR DRUM Rex C. Seanor, Akron, Ohio, assignor to Adamson United Company, Akron, Ohio, a corporation of Ohio Application July 6, 1953, Serial No. 366,105 8 Claims. (Cl. 257-95) The invention relates to heat exchange rolls or drums, and particularly to an improved type of a heat exchange roll wherein the temperature of the roll at different circlunferential and axial portions thereof can be maintained uniform and/ or be predetermined by the use of controlled paths of flow of heat exchange fluid through the roll. Heretofore different types of heat exchange rolls and drums have been provided for use in the rubber and plastics industries for use in the various masticating and compounding operations performed in the plastics and the rubber industries in processing materials during the fabrication of plastic or rubber articles, or to prepare such materials for use in the production of articles therefrom. The heat exchange means as used heretofore may have comprised a cooling fluid carried in a central cavity in the heat exchange roll, or it may have comprised other means for attempting to control the temperature of the heat exchange roll. Also, the prior types of rolls have been very expensive to produce, and they have been limited in the number of flow circuits used in any roll. With the previous constructions, it has been diflicult to be certain that any uniformity of heat exchange action is secured at different circumferential and axial portions of the heat exchange roll except when very expensive andnon-economical types of construction are used. It will be realized that in the processing of various types of plastic materials, the amount of heat transmitted to or withdrawn from the processed material by the roll in contact therewith is a major factor in determining the length of processing of such material that is required and in the properties of the processed material. Thus for effective, eflicient mixing, compounding, warm up or other similar actions, the accurate control of the temperature of the heat exchange roll in contact with the material, andthe rapidity of heat exchange are both important factors in determining the amount of processing required fora given material. The length of processing time, of course, is'a very important cost element in the manufacture of articles from plastic materials.

The general object of the present invention is-to providev a new and improved type of .a heatexchange roll which is characterized by the uniformity of heat exchange action at different axial and circumferential portions of the roll. 7

Another object of the invention is to provide aiheat exchange roll which is economical to manufacture and that has a plurality of controlled flow paths for-heat exchange fiuid in passing through'the roll. Yet another object of the invention is torprovide' a heat exchange roll of relatively low cost and of large size that has a plurality of circumferentially spaced, axially directed holes formed in the roll and with controlled flow paths being provided by flow control means connecting to the ends of such axially directed holes-inthe'roll. Another object of the invention'is t o provideia heat exchange roll which hasin proved heattransfer efli'ciency, and which can be operated at predetermined temperatures to control the heat exchange action in a desired manner and at a desired rate of speed.

Still other objects of the invention are to provide a sturdy heat exchange roll which can be fabricated from steel plate; to provide a roll of the class described which can be readily varied or altered in the manufacture of the roll to provide different controlled flow paths therein depending upon the characteristics required of the roll; and to provide a heat exchange roll which can have any desired strength by varying the wall thickness thereof.

The foregoing and other objects and advantagesof the invention will be made more apparent as thespecification proceeds.

The present invention, broadly speaking, relates to a heat exchanger that includes a roll with circumferentially spaced, usually axially directed holes in the wall thereof extended substantially the entire length of the roll, and flow control means connected to the'holes in the roll at the ends of the holes to determine the flow path for fluids in and through such holes. Other means are provided in the apparatus for passing fluids to and from the flow control means to pass such heat exchange fluids into and from the roll for'heat exchange therein.

For a complete understanding of the present invention, reference should be had to the accompanying drawings wherein heat exchange rolls or drums embodying the prin-' ciples of the invention are shown, and wherein:

Fig. l is a longitudinal section through heat exchange apparatus of the invention wherein heat exchange fluid is taken in at one end of the roll and withdrawn at the opposite end of the roll;

Fig. 2 is a fragmentary vertical section taken on line 2-2 of Fig. l;

Fig. 3 is a section similar to Fig. 2 of a modification of the invention wherein the heat exchange fluid passes axially of the heat exchange roll three times before being 7 discharged from the roll;

Fig. 4 is an enlarged end elevation, partially shown in section, of a modified type of heat exchange rollof the invention wherein the heat transfer fluid is transmitted to and withdrawn from the same end of the heat exchange roll;

Fig. 5 is a fragmentary vertical section taken on line 55 of Fig. 4 to show the heat exchange roll which is adapted to have heat transfer fluid transmitted axially.

twice of the heat exchange roll in passing therethr'ough;

Fig. 6 is a fragmentary vertical section, similar to Fig.- 5, wherein the heat exchange fluid is transmitted th'rough two complete cycles flowing the length of the heat-transfer roll and back; and

Fig. 7 is a fragmentary vertical section, similar to one taken on line 55, but at the opposite end of the heat transfer roll.

The heat exchanger 1 primarily comprises a fabricated metal roll or drum 2 which has a plurality of longitudinally directed, circumferentially spaced holes 3 extending the length thereof. The roll 2 has abore 4 therein and it has counterbored ends 'Sthat connect to the-holes 5 at the ends thereof. e

In order to form a closed, fluid receiving member from the roll 2, a solid end plate 6 is engaged with, as by welding, each end of the roll with such end plates 6 usuallybeing'engaged .with. shoulders 7 formed in the countenbored ends 5 of the roll 2. Such end plates 6 usually have suitable shafts 8 fixedly engaged therewith for use in rotatably positioning the roll 2. Apertured' inner end plates 9 are also secured to the end shafts 6 and such, inner end plates usually engage shoulders iii, formed inthe ends of the roll 2 radially within the ends'of the holes 3 in the counterbored'area thereofso that the inner and; 9, respectively;-are axially spaced from each other to form flow chamber means therebegreasy? tween through which'the' heat exchange fluid flows in practice of the-invention.

To transmit heat exchange fluid to the roll 2, a suitable rotary coupling 11 or 11a is engaged with each of the end shafts 8 and a fluid supply conduit 12 is connected to the coupling 11 for passing heat exchange fluid to the roll 2' from a suitable supply source; The heat exchange fluid is exhausted from the opposite end of the roll 2 through the rotary coupling 11a.

Each of the end shafts 8 are provided with an axially directed bore 13, therein, which bore extends into the bore 4 of the roll 2 and the rotary couplings 11 and 11a have suitable means, such as a bearing 14 and gasket 15 therein, for sealing the rotary end shafts 8 with relation to the remainder of the stationarily positioned couplings.

As an important feature of the invention, each of the inner end plates 9 is provided with a dished or cupped end member 16 welded, or otherwise secured, to the axially inner surface of such end plate and positioned in spaced relation to the inner ends of the end shafts 8, as indicated in the drawings. Such dished end members extend radially of the inner end plates 9 a sulficient distance as to connect to circumferentially spaced apertures 17 provided in the inner end plates 9 for transmittal of heat exchange fluid therethrough. The flow path of heat exchange fluid received intermediate each outer end plate 6 and the adjacent inner end plate 9 is controlled by means of suitable baffles 18 that, as shown in Fig. 2, extend radially of the roll 2 and end plates and connect the individual apertures 17 in the inner end plates to the end of two adjacent holes, for example 3a and 3b, as shown in Fig. 2 for controlled flow of heat exchange fluid to such holes 3a and 3b. The baflles 18 extend to the shafts 8 in most embodiments of the invention, but may terminate short of the shafts in the direct one pass flow pattern shown in Figs. 1 and 2. Supplemental baffle plates 19 usually are positioned intermediate the longer baifles 18 to separate the individual holes 3 in the roll 2 from each other at the radially outer portion of the roll. At the opposite end of the roll 2, the heat exchange fluid exhausts from the opposite ends of the holes 3a and 3b, for example, and with such heat exchange fiuid being directed radially inwardly of the roll 2 to the apertures 17 in the inner end plate at that end of the apparatus of the invention so that fluid will flow into the dished end member 16 at that end of the heat exchange apparatus and exhaust through the end shaft 8 at that end of the apparatus.

In the drawings, possibly the rotary couplings are shown in somewhat exaggerated large size, and the relative sizes of the rotary couplings 11 and the diameter of the roll 2 will be varied dependent upon the load applied to such roll and the use for which the heat exchange apparatus is intended.

Usually the baffle plates 18 and 19 are suitably welded tothe inner end plate 9 with which they are associated. The outer end plates 6 are normally only brought into a tight contact fit with the axially outer ends of the baffle plates and the surfaces to be abutted are suitably prepared so that a tight contact fit can be secured. Actually a little leakage between the different flow compart ments provided in the heat exchange apparatus of the in vention would not be extremely damaging to the functioning and operation of the apparatus, in most instances.

In the modification of the invention shown in Fig. 3, a sleeve or roll 2a is shown which has a plurality of radially extending supplemental baffle plates 19a, corresponding to the supplemental baflle plates 19 of Fig. 1, suitably secured to the inner end plates 9a of the heat exchange apparatus. The roll 2a has plurality of holes 3 extending the length thereof, like the holes 3 in the roll 2. As a special feature of this type of a heat exchange means of the invention, a plurality of circumferentially directed ba'flie plates 20 are positioned intermediate alternate pairs of the baifles 19a with such baffles 20 being positioned in closely spaced radial relationship to the holes 32:, as indicated so that heat exchange fluid passing from one hole 3zwould be led back into the circumferentially adjacent hole 3e for axial flow in the opposite direction and for connection to suitable exhaust means at the opposite end of the roll.

It will be realized that Fig. 3 is taken at the same place as Fig. 2 and that a similar section taken at the opposite end of the apparatus would be the same as Fig. 3 with the exception that the baffle means would have been moved backwardly circumferentially one hole in the roll to connect the first hole of any series of holes to the second hole for transmittal of fluid back axially of the roll and with the discharge of the heat exchange fluid being made when it has made its third trip axially the length of the roll 2a.

In the embodiment of the invention shown in Fig. 4, the apparatus is adapted to supply and to exhaust the heat transfer fluid from the same end of the heat exchange apparatus of the invention. Thus the heat exchange fluid can be led through one cycle of flow axially of the roll shown and then back axially of the roll for exhaust from the apparatus. Or, if desired multiples of such type of flow can be secured by having the heat exchange fluid flow back and forth twice axially of the roll,

or three times, or more, as desired. Thus a fabricated roll 2c is provided which has holes 30 therein and with inner end plates 9c being provided at the ends of the ap paratus. A special feature of this type of apparatus is that a dished end member 160 is secured to the inner side of the inner end plate 9c, and that a second dished end member 21 is placed axially within and secured to the inner end plate 90 radially outwardly of the dished inner member 160, as indicated in Fig. 4. A slightly different type of a rotary coupling 110 is shown in engagement with the end shaft 8c and it has a heat exchange fluid supply conduit 12c connecting thereto. Such heat exchange fluid passes to the inner dished end member 160, through apertures in the inner end plate, up along baffies for flow to alternate members of the holes 3c. The remaining alternate holes 30 then are connected by means of supplemental baflie plates 19c to discharge apertures 22 provided in radially outer portions of the end plates 9c which in turn connect to the chamber formed intermediate the dished end member 16c and the outer or large dished end member 21. A discharge tube 23 is stationarily positioned by the coupling 11c and extends through the bore of the end shaft 8c into the'cornpartment formed by the dished end member 21 for flow of heat exchange fluid from the apparatus of the invention. A suitable discharge conduit 24 connects to the coupling 11c for discharge of heat exchange fluid therefrom.

Fig. 6 of the drawings shows yet a further embodiment of the invention modifying the structure shown in Fig. 4 wherein it is desired to have two complete passes back and forth of the heat exchange fluid when passing through the heat exchange apparatus of the invention. Thus baffles 18d that extend the complete radial length of the heat exchange means of the invention are'provided for connecting the fluid input apertures 17d to certain ones of the holes 3d provided in the fabricated roll of the invention. The next succeeding hole 3d provided in the roll in the forward or progressive flow path provided in such means then is connected to its next circumferentiallyadjacent hole 3d by means of supplemental baffle plates 25 extending circumferentially of the-roll and terminating against another radially directed baflie 26 used for further control of the flow path or pattern in the heat exchange means of the invention. Upon its return from flow axially of the roll through a complete flow and return cycle, the heat exchange fluid then exhausts from the next adjacent hole 3d and flows intermediate the baflie 26 and the adjacent baffle 18d to a discharge aperture 22d provided in the inner end plate 9d at 'a' radially outer portion thereof. A further stop bafiie- 27 is provided to prevent unnecessary turbulence in fluidflow through the heat exchange means. It will be realized that in apparatus of the type shown in Fig. 4 through Fig. 6 in all instances, the apparatus at the opposite end of the roll need only be arranged to connect two circumferentially adjacent holes in the fabricated heat exchange roll so that the desired progressive and controlled flow pattern in the roll can be maintained at such end of the roll which is used only for coupling adjacent holes together in the flow path.

Fig. 7 shows the roll 20 which has the holes 30 provided therein and in this instance, pairs of circumferentially adjacent holes are connected together by means of baflies 28 extending radially of the roll 26 and by circumferentially directed baffle 29 positioned immediately radially within the ends of the holes 3c. Thus adjacent circumferential pairs of the axially directed holes are connected together to provide any desired number of even passes of the heat exchange fluid axially of the heat exchange roll means of the invention.

It is thought that a sturdy, relatively low cost fabrication type of a heat exchange roll has been provided by the invention wherein the number of passes of the heat exchange fluid axially of the apparatus can be easily controlled and varied in the production of the roll so that any predetermined temperature limits can be maintained on the surface of the roll, as desired, dependent upon the desired characteristics and the use of the roll means of the invention. The roll is particularly adapted to be made of large diameters such as 60 inches and to have a length, for example of 88 inches.

Of course, the wall thickness in the fabricated roll used in the heat exchanger can be varied dependent upon the strength desired in the rolls, and the heat exchange properties desired.

The heat exchange means of the invention can be used with steam for heating desired material associated with the rolls, or even hot oil or other fluids can be used as a heating medium for extremely high temperatures. Likewise, any desired cooling fluid can be used in the apparatus of the invention and any conventional rotary coupling means can be used for passing fluids to and from the rotatable portion of the apparatus. Preferably a fabricated roll is used in the heat transfer means as it can be rolled up from a plate which can have the desired holes drilled or otherwise formed therein so that a sturdy construction can be achieved. The baffle and flow control means are readily attachable to such a fabricated roll. Accordingly, it is submitted that the objects of the invention have been realized.

While several complete embodiments of the invention have been disclosed herein, it will be appreciated that modification of these particular embodiments of the invention may be resorted to without departing from the scope of the invention as defined in the appended claims.

What I claim is:

1. A heat exchanger comprising a roll having a plurality of longitudinally directed circumferentially spaced holes extending the length thereof, said roll having a bore with counterbored ends and with said holes connecting to the counterbored end areas thereof, end plates secured to said roll across said bore at each end thereof but exposing the ends of said holes, an outer plate secured to said roll at each end thereof and spaced from said end plates to form flow chambers therewith connecting to said holes, one of said end plates having apertures therein, a pair of spaced concentric dished shells secured to radially spaced portions of said apertured end plate on the inner surface thereof, tubular means secured to and extending through said outer plate and said apertured end plate for passing fluid to one of said shells and from one of said shells, said apertured end plate having two radially spaced annular series of apertures therein with each of said shells connecting to a different series of said apertures, and baffle means in said flow chambers to control flow of fluid through said holes and flow" chambers.

2. A heat exchanger comprising a roll having 'a plurality of longitudinally directed circumferentially spaced holes extending the length thereof, end plates secured to said roll across said bore at each end thereof but ex posing the ends of said holes, an outer plate secured to said roll at the ends thereof and spaced from said end plates to form a flow chamber therewith connecting to said holes, one of said end plates having apertures therein, a pair of spaced dished shells secured to radially spaced portions of said apertured end plate on the inner surface thereof, means secured to and extending through said outer plate and said apertured end plate for passing fluid to one of said shells and from one of said shells, said apertured end plate having two radially spaced annular series of apertures therein with each of said shells connecting to a different series of said apertures, and baffle means in said flow chambers to control flow of fluid and connecting circumferentially adjacent holes together at the end of said roll having the solid end plate therein and connecting alternate holes at the opposite end of said roll to one of the different series of holes in said apertured end plate.

3. A heat exchanger comprising a roll with circumferentially spaced holes in the wall thereof extending the length thereof, flow control means connecting to said holes at the ends thereof including radially extending baflle plates to determine the flow path for fluids in the roll, and means for passing fluids to and from said flow control means to pass heat exchange fluids through the roll.

4. A heat exchange drum comprising a roll with holes in the wall thereof extending the length thereof, flow chamber means connecting to said holes at the ends thereof, fixedly positioned, radially extending batfle means in said flow chambers for determining the flow path for fluids in said flow chamber means, and means for passing fluids to and from said flow chamber means.

5. A heat exchange drum comprising a hollow roll with holes in its wall extending the length thereof, disc shaped flow chamber means including and defined by a pair of spaced end plates carried by said roll at each end thereof and connecting to said holes, baffle means positioned in said flow chamber means to determine the flow path for fluids flowing through said flow chamber means, shaft means for said roll connected to said end plates, and means for passing fluids through said shaft means to and from said flow chamber means to provide a fluid flow path through the heat exchange drum.

6. A heat exchange drum comprising a hollow roll with holes in its wall extending the length thereof, a disc shaped flow chamber means connecting to said holes, baflie plate means positioned in said flow chamber means to define and control the flow path for fluids flowing through said flow chamber means, shaft means for said roll, and means for passing fluids through said shaft means to and from said flow chamber means to provide a fluid flow path through the heat exchange drum.

7. A heat exchange drum comprising a hollow roll with holes in its wall extending the length thereof, flow chamber means connecting to said holes at both ends thereof radially extending baflle means positioned in said flow chamber means at both ends of said roll to determine the flow path for fluids flowing through said flow chamber means, said baffle means at opposite ends of said roll being of different construction, and shaft means for said roll providing fluid flow connections to said flow chamber means.

8. A heat exchanger comprising a hollow roll having a plurality of longitudinally directed circumferentially spaced holes extending the length thereof in the Wall of the roll, means secured to said roll at each end thereof but exposing the ends of said holes and forming flow chambers connecting to said holes, one of said means l havingapertures therein; a pair of spaced members se- I ReferencesCitedin the, iileof1 this patent cured to said apertured means on the inner surface. UNITED; STATES PATENTS thereof and defimngtwo separate chambers," tubular V 50 86 C a! N 7 18 means extending through said apertured means for pass- 3 Bowen at r g ing fluid to one of said chambersand from the other of 5; 1 38 i "i said chambers and baffle means. in said flow chamber r 2 5g g: at said apertured means to control flow of fluid to and 1:781:378 Feeney Nov.

from said holes from and to said chambers. 

